Your API key is a unique alphanumeric identifier associated with your account and is used for universal authentication commands for all of your services.
The key is your API access key. The key can be obtained from the Rackspace Cloud Control Panel in the <Your Account>/API Access section.

nickname

optional nickname to identify the connection.

remote path

An optional remote path that you specify, if you would like to map to a specific directory.

drive letter

Drive letter which expanDrive will map to your rackspace cloud files.

Click on Validate Credentials.

Click on Connect.

ExpanDrive connects to the service, and the file browser interface native to your OS will open upon a successful connection.